- #1
How to Solve Newton's 3rd Law Pulley Problems?
- Thread starter HydroMarioUSA
- Start date
-
- Tags
- Law Newton 3rd law Pulleys String Weight
Click For Summary
Homework Help Overview
The discussion revolves around solving problems related to Newton's 3rd Law in the context of pulley systems. Participants are exploring the relationships between tension and mass in a massless pulley setup.
Discussion Character
- Exploratory, Assumption checking, Problem interpretation
Approaches and Questions Raised
- Participants are discussing how to start the problem, particularly focusing on free body diagrams and the relationships between tensions T2 and T3. Questions are raised about deriving mass m2 from known tensions and analyzing forces acting on the blocks.
Discussion Status
Some participants have provided guidance on the importance of free body diagrams and the concept of tension in the system. There are multiple interpretations of how to relate the forces and tensions, indicating an ongoing exploration of the problem.
Contextual Notes
Participants mention the rules against providing direct answers, emphasizing a focus on understanding the setup and relationships rather than jumping to conclusions or solutions.
- #2
HydroMarioUSA
- 10
- 0
Apparently, it's against the rules to just ask for answers, but could someone tell me where to start?
- #3
Biker
- 416
- 52
Hello, Welcome to physicsforums 
.Yes, It is against the rules to give direct answer. We can only give where to start from and the rest is on you.
Massless means that the tension is the same along the string. So what you need to do is to get the free body diagram for each block. Try to find the tension in T3 and T2 then get m2
.Yes, It is against the rules to give direct answer. We can only give where to start from and the rest is on you.Massless means that the tension is the same along the string. So what you need to do is to get the free body diagram for each block. Try to find the tension in T3 and T2 then get m2
- #4
HydroMarioUSA
- 10
- 0
How do you get m2 from knowing T3 and T2, sorry if it's obvious?
- #5
Biker
- 416
- 52
What do you get from analyzing the forces on M2?HydroMarioUSA said:How do you get m2 from knowing T3 and T2, sorry if it's obvious?
- #6
HydroMarioUSA
- 10
- 0
Net force, right?
OH I see thanks!
OH I see thanks!
- #7
HydroMarioUSA
- 10
- 0
Would T3 = Fg on m3 and T2 = Fg on m2 + Fg on m3? Is that how it works?
- #8
Biker
- 416
- 52
Yes, That Fg on m3 comes from the tension in T3 it pulls up m3 and pulls downward on M2 so that M2 can pull it up :)HydroMarioUSA said:
- #9
HydroMarioUSA
- 10
- 0
Is the answer (D)? The way I got it was by knowing that T1 = 182.28, and subtracting that by the forces of gravity on T1 and T3, then finally dividing that by 9.8...
- #10
Biker
- 416
- 52
Yes the answer is D.HydroMarioUSA said:
Similar threads
- · Replies 8 ·
- · Replies 2 ·
- · Replies 10 ·
- · Replies 12 ·
- · Replies 12 ·
- · Replies 3 ·
- · Replies 15 ·
- · Replies 2 ·
- · Replies 2 ·
- · Replies 5 ·